Bitcoin is also deflationary,
False. Bitcoin is disinflationary. ~10% inflation now, ~5% 2016 , ~2.5 2020, ~1.25% 2024, ect....
http://www.investopedia.com/terms/d/disinflation.aspNxt has 0 inflation now after the ICO, and Bitshares has moments of hyperinflation ~2Billion to ~2.5Billion (unknown when and if this will occur again)
you can petition to change Bitcoin to inflationary. You can go ahead and push for your ideal model. It has nothing to do with PoS, since it can do both.
Bitcoin is unlikely to ever remove PoW because of vested interests and security concerns, but I could potentially see a TaPoS layer one day added upon it to enhance security and confirmation speed. Discussing the possibility of convincing miners and vested interests from switching completely away from PoW or changing the 21 million limit appears to be an effort in futility.
Good news ..... Once miner block rewards are minimized , security may have to be supplemented with many other discussed means, thus there isn't some infinite energy drain that some PoW critics suggest. PoW will essentially be limited by profitability from transaction volumes and thus hashrate will only be increased based upon ASIC effieciency advancements or if we develop unlimited power from fusion tech(unlikely).