T4 -> T5 vs another framework?

[Josh Joy]

Hi,
   
  I thought I would put this out here...as a caution, not trying to start any 
flames here, just a logical question...
   
  Currently I'm using Tapestry 4.0.2....I  was curious if anyone else was in 
the same position as I, basically I'm looking to upgrade to T5. However, 
considering the lack of a compelling migration plan to T5, I was curious if 
anyone else has considered the benefits/costs of going to Tapestry5 vs another 
web framework?
   
  Thanks,
  Josh