I think Pentax has the 4th or 5th biggest DSLR market share, it should be one of the options on your poll, not just an "other".
Pentax K100D user here
2007 DSLR Market:
1. 42.7% Canon 3.81M bodies
2. 40.0% Nikon 2.98M bodies
3. 6.0% Sony (Should be about 447K bodies)
4. 6.0% Olympus (Slightly behind Sony in units sold)
5. >5.3% Pentax
Then you have Sigma, Fuji, Samsung (.6%- less than 50K bodies) and Leica in unknown order (There were many more 2006 numbers floating around than there are 2007 numbers.) So Pentax, Sigma, Fuji, Samsung, Panasonic and Leica all split the remaining 5.3% market share- so being "5th biggest" really isn't all that "big" in today's DSLR market, in fact it's basically last in terms of "have our own system and produce a fair number of bodies," since all the other niche players use a mount common with someone else except Sigma who really don't seem to be going anywhere.
The 2006 stats for Sony and Oly are within two tenths (.2%) of a percent, and Pentax had 5.4% of the market then (just shy of 286,000 bodies.) Canon lost 4% from 2006- but Nikon gained 7%- so there's a net 2.9% gain in the top 4- That's not all at the expense of Fuji (who are basically out of the race but likely don't account for 1% of the market-) and the 2007 numbers were 10 months of pre-D3/D700 sales- so Pentax has to have lost more than .1% of its market share in 2007. If they got to 5%, that'd net them about a 30% increase in unit sales (high tide raises all ships,) so if it were economical to produce then, it's still good (they're likely not about to tank on the loss in share IOW.) However, you have to wonder how much of their previous lift was film to digital converts who aren't likely to update for a couple of years. Given Nikon's high-end releases in the 4th quarter of 2007, they're likely to continue to gain share mostly at the expense of Canon- but if they do release a new D40 price point camera next year, it's likely to eat share off the smaller fish too. Samsung is likely to gain more share as well, especially in their home market- I doubt that's going to come out of Canon or Nikon's pieces of the pie as much as it will Sony/Oly/Pentax.
To look at the data another way, out of the 7.45 Million DSLRs for 2007, 1.29M weren't made by Canon or Nikon, 841K weren't made by Nikon, Canon or Sony and 394K weren't made by Canon, Nikon, Sony or Olympus.
We're left with roughly 350,000 units for Pentax, Sigma, Panasonic, Leica and the remaining stock of Fujis.