If he trained for it a little more, adding some much longer runs, he might come close to 2:30-2:40 in the spring.
But he may run the whole race and refuse to cross the finish line. He would just stand there in the middle of the road right before the line, as a protest against having to pay a high entry fee to run a race to which corporate sponsors donate lots of $ to but from which the athletes really do not benefit.
Another scenario is that he runs a marathon as a bandit, not willing to pay the entry fee, and he just stops and walks away without crossing the line. So his time will not be entered in the results as he does not officially finish. Runs as a bandit because he could not reach a sponsorship/appearance deal with the race.
He might also enter under an anonymous name, believing it is unjust that an event might receive attention and publicity due to his presence without properly compensating him.
If he could negotiate some type of favorable sponsorship deal with an event a year from now, where RunGum is featured prominently with little investment and he receives an appearance fee, he might be close to 2:20.
Or he might just pace a group through that event and finish in 3:30-4:00, stopping every 5 miles to hold a competition to determine who could blow the biggest bubble with Rungum.