The problem with 5 wins is that it isn't really any better than 2 wins to recruits, TV, casual fans, or prospective conferences. It's a non bowl season. The levels of CFB success are:
No bowl game
Bowl game
Conference Championship
BCS Bowl Game
NCG
NC
You can always parse further with win this bowl game, beat your rival, or a better bowl game invite or not being a complete laughingstock.
5 wins would make us not a complete laughingstock. Whoopee. It doesn't mean momentum for next season, you could just as easily stay at 5 or drop to 3 as you could jump to 7.
Long term builds are not what CFB is about. You have 2 maybe 3 productive years from players. Young needs to mix with old, offense needs to mesh with defense. You can have a senior laden team have it's one day in the sun, but if that day is 7 win trip to the Bahamas bowl, is that worth 3 years of sub .500 FB? To me that is the definition of a terrible program (or Rutgers).
Edsall built a brand for 4 years then got a pop with a near BCS bid, regrouped and then got it and underachieving that season in doing so. (Loses to terrible Temple and Louisville, dropping a game to a beatable Michigan team). That's what you want out of a four year cycle.
And forget continuity. Edsall was an outlier in longevity. Coaches need to win with players they didn't recruit. The bulk of Bob's first full recruiting class won't play a meaningful snap if at all until next season. They'll be RSr's, in 2019. No one is waiting that long, not even Bob.
There is enough size, strength, and speed right now to beat most of the teams on this schedule. They need to execute individually and as a unit. Can Bob get them to do that? A good coach would.