Tesla has be the benefit of the SuperCharger network, but that will be changing rapidly since Porsche isn't tying themselves to a proprietary fast charging system as far as I know. But besides, some of the Tesla make the argument they never need to supercharge depending on the context of the argument
I think Tesla will be suffer significant competition as other automakers start producing EV's, especially ones built with better quality, reliability, the ability to actually get it serviced in a reasonable amount of time, get body work done locally, etc. The Tesla fanatics say that Tesla has far more experience, when in reality out other brand have been making hybrids for years which is a similar but far more complicated endeavor than building a simple EV. As for batteries, Tesla may benefit from having their own battery production, but building everything in-house doesn't always end up being the best decision in the long run. It's not like there aren't a number of other battery producers out there who will be more than willing to supply the automotive market with a new wave of battery applications.
Tesla's was previously leading in technology, their autopilot in particular, however many claim GM/Cadillac's system is just as good if not better. Google is starting to license out Waymo (to Jaguar, Land Rover, others?). Every car company knows autonomous driving is the next big thing and investing heavily in it or partnering with companies with experience. I imagine in several years all autonomous driving capabilities will be relatively comparable and Tesla will no longer have an edge.
Tesla does have the benefit of not necessarily being innovative, but daring to put things into production that other companies won't. So in that respect they may be able to maintain their status. But if they don't continue to pull tricks out of the sleeve I can't see them "dominating" the automotive industry. I love their hype though "Model 3 best selling luxury car" playing off the fact everyone is buying luxury SUVs (although we were told the Model 3 wasn't a luxury car?). Or the Model S outsells its class - allegedly being the S-Class, 7-series, A8, XJ, LS etc - despite the fact size-wise and cost-wise it's more in line with an E-Class/5-series/A6/XF/GS.