The lack of recruiting momentum for 2019 is certainly a concern, but I still think it is a little early to panic. I would like to see us in the market for one or two traditional transfers, who would be eligible in 2019 (or earlier, if the rules change).
But beyond that, there seem to be 2 likely scenarios, each of which give me a little comfort:
1- We suck in 2018-19 and Manning is gone. Makes lack of 2019 recruits less of an issue because a coaching search would likely mean any 2019 commits would be looking for an exit anyway. New coach means new start.
2- We are good in 2018-19 and Manning is able to parlay that success (and job security) into a couple of decent 2019 recruits later in the process.