No.
I've started typing several long responses but each time I delete them. I'm trying not to get too verbose.
The 3 would be delayed if Tesla were too thin. Tesla wouldn't have bumped up the Y if they're too thin. They wouldn't be releasing the semi truck prototype if they were too thin. They wouldn't be producing power walls and power packs. They wouldn't be actively searching for new Gigafactory sites.
*If the 3 launch goes well, that will fund everything.* It will pay off current debtors and provide confidence to future creditors that Tesla is a smart investment. That money will fund everything that might make it appear that Tesla is stretched too thin.
It will probably take another 5-10 years for Tesla to build out its infrastructure to a level where it no longer *needs* to continue taking on debt and creating new factory-intensive infrastructure. I'm talking about finishing the 3 line, Gigafactory I and II, and securing everything necessary for Gigafactories III-n (for now, let's say VI - for the US, Europe, India and China). That's also assuming all future Gigafactories are combined battery factory and car factory. Think about it, once those are all built out, it's pure profit for Tesla (simply speaking). But until they are, it's "cash burn, cash burn, cash burn".
Sharif don't like it, rock the cash burn. Rock the cash burn.
I think autopilot, UI upgrades/changes, fixes to the falcon wings or drive trains or similar issues, new superchargers/service centers/showrooms are inconsequential in the grand scheme of things in terms of cost. And Tesla cannot simply put future vehicle models on hold until the 3 is 100% ramped up. They might *ease* current issues only to set themselves up to rush future projects, creating future issues.
That's not even mentioning power walls and packs, or solar roofs and solar panels.
Is Tesla extending itself? Oh heck yes. Is it over-extended? I don't think so at all. It'd be pretty apparent. There'd be delays, contractors not getting paid, software updates would go on hiatus, etc. And none of that is really happening. But it's certainly a line that Tesla is trying to correctly walk. They could fall the wrong way if things don't go well for a few straight quarters. And yet, if things continue swinging upwards for a few straight quarters, all of this kind of talk will disappear forever. If they can hit 20k 3's this year and 200k next year...its over.
Flip flip flip flip, game over.