Probably, but you're relying on Bitcoin's success with 21M's power supply, right? Following this logic, of course, the ETH price could be analyzed through a smaller offer. Would ETH cost the 2x if the supply was 2x smaller?
Of course, due to its popularity as a launchpad for most projects, everything would be different right now. High demand plus X2 fewer coins in the circulation would mean a much higher price than it is right now(am not going to use your x2 price increase assumption)
Let's say Ethereum had 1/2 the number of coins it has right now.. that would be roughly 52.5M Ethers. Now current market capitalization of ethereum is at $14,511,391,446 just barely enough to keep at second place from Ripple.
Imagine if ether's price was the same as it is today, the Market cap would be $138x52.5M = $7,245,000,000. this would be way so far away from ripples marketcap which would seem unrealistic since the two have quite very close market caps .
total max supply won't stop a good coin from reaching its goal so I'm less worried about max supply and even other altcoins with billion max supply are doing fine e.g ripple so let's wait and see what comes next after POS ETH upgrade
Am not saying it would stop anything... but the price would continue to depreciate over time due to an increased supply of coins. Look at ripple for example, how much is one coin?