For new applications you are encouraged to use TAP::Harness / TAP::Parser. The awkwardness of Straps was one of the reasons to embark on a rewrite of Test::Harness and the new code should make it far easier to write ad-hoc testing applications.
That leaves the question of what should happen to Straps. As Schwern points out it will still work once you have installed Test::Harness 3.0 - but it would be orphaned: installed but unmaintained with no updates available.
The solution might be to make an independent release of Test::Harness::Straps. There's a slight danger then that people would continue to use it for new code but the documentation would carry warnings about the inadvisability of that - and ultimately if someone finds it useful, why not?
Let me know what you think.