There are highly specialized walled gardens folks can create for themselves but that is hardly representative rationale of adding a required feature to the Mac Pro.
Of the following list of the TB drives than half the SATA drives can be ejected.
Seagate GoFlex [ Ejectable $245 ]
http://www.seagate.com/external-har...rives/performance/goflex-for-mac-thunderbolt/
Seagate Desktop [ Ejectable ~$360-400 ]
http://www.seagate.com/external-hard-drives/desktop-hard-drives/goflex-desk-mac-thunderbolt/
Lacie LittleBig [ non ejectable ~$499 ]
http://www.lacie.com/products/product.htm?id=10549
Lacie Rugged [ USB 3.0 $199 ]
http://www.lacie.com/products/product.htm?id=10599
Lacie RAID various versions [ ejectable $499+ ]
http://www.lacie.com/products/range.htm?id=10061
Promise J4 [ non-ejectable $400+ ]
http://www.promise.com/storage/raid_series.aspx?region=en-global&m=192&rsn1=40&rsn3=62
Promise J2 [ non-ejectabe $499 ]
http://www.promise.com/storage/raid_series.aspx?region=en-global&m=192&rsn1=40&rsn3=60
Promise R4 $6 [ ejectable $600+ ]
http://www.promise.com/storage/raid...b_m=sub_m_8&rsn1=40&rsn3=47&statistic=pegasus
At least half of these have no problem dropping a SATA drive into something like
http://www.amazon.com/Thermaltake-5-0Gbps-Docking-Station-ST0019U/dp/B003ZUXXVU/ref=pd_sxp_f_pt
So it isn't even the TB drive market that is at issue. Just a
subset of the TB drive market. And at those average prices, and even if a frequent occurrence, a mere $599 Mac Mini would work just fine as a dedicated sneaker-net data ingest station at a cheaper cost than several of those drives; let alone a Mac Pro.
This is a very narrow, highly transitory issue. No PC oriented shop is going to be forced into buying Mac Pro with Thunderbolt if a small subset of their customers have TB drives. This is far more if there is an Apple kool-aid drinking shop they'll want an Apple kool-aid Mac Pro. Even Apple isn't primarily focused marketing wise on kool-aid shops. By definition kool-aid shops will buy what they are told to buy.
But mac users tend towards the shiny, thinner, newer, higher tech stuff.
TB drives are neither more shiny , thinner, newer , nor (as single function, single disc ) more high tech.
Nor does Apple particularly add hardware just because it is shiny or newer. USB 3.0 was certainly 'new' in 2011 it was no where to be found on Mac hardware.
As far as the TB monitor point, if Apple can engineer TB ports into the Mac Pro, then there is no more reason to carry the non-TB monitor!
One less SKU!
The 27 iMac can be a monitor so two less SKUs.
They probaly won't because the 27 iMac serves a differen function. The TB "display" is really a docking station. Apple has plenty of room for a real 27 Monitor. A real monitor as in:
no mag safe power cord (or extra large power supply).
more than one video input connector ( 2 mini DP or 1 mini one full size DP or 1 mini , one DVI , one full size DP ... etc. ). That means
no semi-permanently attached video cable.
A simple industry standard USB hub.
Better than industry standard backlighting ( perhaps high gamut LED backlight if want to goose the price point).
A $799
monitor would like sell in significant number versus their $999 docking station. For those that may need two or three it is far more cost effective. Few in a multi-monitor set up need a 3rd Ethernet port or a 8th Firewire port. A monitor would serve a different function than a docking station does.
A mini DP monitor would still be a compatible chain ender on a Thunerbolt chain but it is also useful on a wider set of computers. That is exactly way there has been no huge flocking to producing TB monitors/docking stations by the overall market.
If Apple released a Westmere Mac Pro with 1 year old video cards but with Thunderbolt ports it would be a failure in the market. Thunderbolt is not a critical mass feature for the Mac Pro. There are minor niches it allows entry to but it isn't a show stopper.