I don't think it would make sense for Steemit Inc to prioritize steemit.com in blockchain development to a significant cost to every other app. Why? Because Steemit Inc stands to benefit enormously from the price of STEEM going up as they are the single largest holder of it. They could do it out of sheer stupidity but what will ultimately drive the price of STEEM is adoption. To hamper adoption in any way would not be in the interest of any holder of SP.