He says he doesn't know how to deal with the situation but it's pretty simple, play excellent in the second team, train to the best of your ability. This is a chance for him to get even better, direct that emotion to excellent training, unleash that hunger for goals.
If he performs for the second team he might get another chance but even then, if we are chasing a goal there is a good chance he will be subbed on especially if we are creating chances and also I would back him to get on the end of one of those.
He has had a horrible injury but his career is far from over, he does need to work hard to find that form but there is no reason a player of his ability can't be a star again. Even if he has lost a yard of pace, he seems to be an intelligent man, he just needs to adapt his game. In the box he is lethal, capable of scoring so many different types of goals, in an attacking team that has players to create a lot of chances he will probably be fine.
He has been in a side this season not creating chances but even moreso he has been asked to play as a creative striker, Louis van Gaal has said he likes strikers to also create chances and has referred to Falcao as one of his creative players but it's not really his game.
To put into context how good this guy was, he scored for Atletico in 2012 - 13 in La Liga 6 less goals than Ronaldo in the same amount of games but that season Atletico scored only 65 goals, Real Madrid scored 103, had Falcao been in a side creating chances like Real Madrid he would have got a lot more goals. He can still bounce back, I'm not sure what team will take him next season but I am sure he'll do well wherever he ends up.