Think you're being optimistic with Tierney given his history of injuries. If he's no longer involved then presumably we'd set up differently. You're right though someone needs to be thinking 5 years ahead.
I'd love to think Archie Gray might be part of that set up but suspect that won't happen.
I think midfield and defence aren't too bad. Forwards as usual looks the most worrying area, maybe Wilson at Villa, maybe Mellon. Next to that who'll be back up keepers, Slicker? Craig Gordon?