No one has a chance to be successful with the OL that has been on the field. No coach, no quarterback, no one.
IMO, Long will probably start at one G spot next year, so they need to plan on finding a new RT and C for sure. Scherff or Ogbuehi will be available in the top 5. Or trade down to acquire as many usable picks for this year in Rounds 1 and 2. But no matter what, two of them must be spent on OL that can start week 1 next year.
WalterFootball.com: 2015 NFL Draft: Offensive Tackle Rankings
WalterFootball.com: 2015 NFL Draft: Guard Rankings
WalterFootball.com: 2015 NFL Draft: Center Rankings
It must be done.