Actually Bush didn't wait until his second term. He was working early on his administration to pass immigration reform, Colin Powell (Secretary of State) was directly involved to pass CIR but 9/11 changed everything. Then Bush tried again on his second term.
I think only hard liners on immigration have a reason to "stick with Obama" with his record on deportations and his nule attempt to pass CIR. We cannot uncondionally support democrats when we badlly need GOP support, specially without knowing who will be the GOP candidate and what he have to offer.

keep your friends close, but your enemies closer