Your concern is valid. Given Musk's recent internal cost-cutting initiative announced this week where he and his CFO have to sign off on all expenses (yes the CEO and CFO of a multi-billion dollar company are now reviewing and signing off on all company outlays) it is fair to not expect too much investment in new service centers; super chargers, staff, etc.
Things are likely to get worse than better in the near term as to have parts inventory to provide timely service to SCs takes cash - so they won't build up inventory and instead will cont' down the path of "on demand" inventory which means more time waiting. Additionally, in the cost cutting memo, Musk specifically pointed out "parts" as being a target of the cost cutting. I assume this means reducing the cost of parts going into new cars - so quality of parts may suffer going forward.
No mention of focusing on build quality - which is odd as warranty expenses are Tesla's biggest expense outside of labor and parts. Improving build quality would reduce SC load, improve customer satisfaction, and well reduce cost. I suspect that this is in fact a goal but has not been mentioned as that would imply Tesla cars lack build quality.
If you take a look at staffing where for customer reps, sales associates, etc., all they require is a high school degree and no experience - they are scrapping the bottom of the barrel in areas of staffing they deem not important enough to get the best. That combined with the layoffs - don't speak well for the future of customer service and post sales service.
I am waiting for my LR RWD M3, and I think of these things all the time. I am lucky in that the local SC is not overloaded - yet. I also believe that build quality has in fact improved a great deal and beyond paint issues, you are not likely to have any delivery issues now-a-days. The biggest issue here is if you have an accident or something - you are likely looking at many weeks or worse-case months before things will get fixed up.
I actually thing going Tesla going Bankrupt would be a good thing. Clear the debt, get a different CEO in there, and get the company stable, streamlined, and efficient. What's the chance of that happening? I doubt know. As long as investors are willing to buy Tesla stock and bonds, they will have cash to operate. If that turns, well, as Musk himself stated, they will have about 10 months to turn things around.