[Striiker]

I tend to think that the realistic path will be:
1) complete work on Kunark (give this a year)
2) Release Velious (in about a year, concurrent work on this alongside Kunark)
3) Complete fixes to Velious (6 - 12 months)
4) Go back and fix all of the other issues, low-level bugs, minor changes, etc. (6 months)
5) Release a new P99 server with all fixes etc. in place. Make this a progression which matches what live was in terms of timings.
6) Current P99 server will continue to evolve with custom and/or select content from the official releases..

I think this would be an ideal end-solution. Those who want to continue with their characters which they spent a lot of time on can do so, exploring new content. Those who are interested in re-rolling on a new, highly-classic server can move to the new P99 server. I tend to think that this end scenario is about 3-4 years out.