Changing to PoS could solve some problems, like the problem of current miners crying for more fiat as income.
changing to POS wont help anyone because if BTC is change into POS then the value of it will drop too, leaving it meaningless to be just useless coins and not BTC anymore. Forking it in 20mb block will atleast make some decent effect to that
The price seems to drop whether we keep the current over-expensive mining or not. The meaning of the coins doesn't (or should not) come from how expensive the mining gear is.
The price was rising when people were hiding the money into Bitcoin (also with help from Gox bot). Since then people realized that Bitcoin can be traced and wallet can be somehow linked to person. What if they'll go for Monero, eh?
The 20Mb fork may have some meaning. Also having per kb fee is a reasonable option. However, the history shows that bitcoin is extremely reticent to forks.
Maybe someday Bitcoin will drop the fear of the forking, maybe it will take a look what the "shitcoins" can innovate and learn from them. Being the first may not be such an advantage after 5 more years, and just debating and over-debating is not too helpful.
Yes it is not based on the mining equipment and of course even if you need such expensive mining equipment and the price of mining still larger than the current price , what do you think of getting bitcoin from POS? it will ofcourse be such lower. In addition, some feature of shitcoins is a great feature, no doubt about that but changing to POS is not a good thing to follow