It would be great to keep the 777s, but I just don't see it happening. There is no work for them anytime soon. They burn cash sitting on the ground doing nothing. They own 4 of them, and the creditors will be wanting to sell them for the $$$. The administrators would then try and convince (which they appear to be doing) the new owners to get cheap 787 leases for a replacement. But again, I don't see 787s happening anytime soon.
If Virgin 2.0 has any chance of survival, it really needs to focus on the lean domestic market with one fleet type. Drop everything else, and re-build from scratch.