On any given year with poor leadership and cap managment, sure. I think Houston will be a force down the road though. Watson is great and they will be a team to deal with moving forward. The QB is one of three parts you need, the others are coaching and cap management. The Saints have struggled with cap management. Tee Falcons have struggled with coaching and cap management.
In general if you get a top 5 type QB you should be able to consistently compete. I still think we need the element of time to put Allen in that category.
The other thing, a couple examples of teams that had success only to fall off once the OC left, Philly and Atlanta....the new OC (if Daboll leaves) will be really important.