Hey, PSU fan coming in peace. Just wanted to lend my two cents.
First, we are really happy to have Cabinda on board, but we know how it stings when kids decommit. We've had more than our fair share the past two years (for obvious reasons, most of the time). Can't blame the kids. Moving on:
O'Brien certainly might leave for the NFL, but I would put that likelihood way below 75%. Maybe 10% this year. Last year, you can't blame him for looking, but reports were that was more to leverage a new contract that was a bit shorter (from 9 to 5 years) and better for his assistants. There is also this quote from recently committed Mike Gesicki:
Now, I know coaches will always say they want to stay, but that's some pretty definitive stuff.
A note on putting players in the NFL, 'Cuse has done a fine job. But PSU has, as well, especially at Cabinda's position: Sean Lee, Paul Posluzny, and Navarro Bowman are stars, while Dan Connor, Mike Mauti, Derek Wake, and Gerald Hodges are all in the League. Some players with lesser talent were molded into NFL linebackers, as well (Tim Shaw, Nate Stupar, run-on Josh Hull). Gotta admit, that's a pretty attractive track record, all in the past ten years.
In closing, good luck on the rest of your class and your season, but GO STATE, BEAT THE BUCKEYES!