To get a young owner group they need to make a car that can be sold for less than £25,000 and is cheap to repair. I don't think that, given the way Morgan builds cars, this is possible.
I think you're quite right about getting the entry level down as low as possible. Caterham offer factory-built Seven 160s for £18k, so 25k isn't completely out of order, I would have thought - but the insurance issue is always going to be a killer.
For me, the best strategy for Morgan would be to focus on their core buyers: middle class middle aged blokes who want something different and characterful, and have got 30 to 60k to spend on a car which is rewarding to drive but not unusably fast.
Competing with Aston, Ferrari and Porsche is never going to work, the buyers are just too fickle and intolerant.
This doesn't mean I think they should stick with the trad designs, I think a combination of aero-style chassis, modern 4-cylinder engines, and a slightly more aerodynamic (and crash friendly) DHC body shape could be a winner.