I highly doubt that. Monopolies do not tend to develop what is best for consumers, but what is best for their bottom lines.

It also depends on the criteria on which you judge it. I may be better in terms of compatibility because everything would be an expensive walled garden like Apple's. It would be worse in terms of choice because niche peripheral makers might not be able to enter the market at all. And it would certainly, almost guaranteed, be much much worse in terms of personal freedom because no-one would be allowed to modify any parts of any piece of software without some cryptographic hardware module stopping them. Imagine that situation, and then imagine how a government would use that to impose surveillance on all personal computing devices.