@ktj I had all that, key role in a high margin strategic initiative, and just left. There's no investment in the future, either products or people. Sure, you might not get whacked and run for a few years, but is that really the kind of thing you want to tie your own future too? While the work and products today might be somewhat current, it's just a few years neglect from being the next lotus, rational, websphere or Tivloi - all once great, high margin strategic brands that are now dying or dead, for both the technology and careers. Ibm is the best at milking and discarding both products and people.
To the op: go in with your eyes open and be your own career advocate. If Ibm sticks you on legacy platforms, or their inferior cloud tech, get out before you get stale and unmarketable, they will not invest in you, don't expect retraining or moving to better tech - you're likely to be 'too valuable to let go' if you're not out first.