This is because Disney has terminated contracts with Activision and Capcom. This means that no new retail or DD download for all Marvel games from third-parties will be removed and not go through any more retail shipments.
This means that they will most likely become more rare goodies. if you nver got Deadpool, all those spider-man and X-men games, or Marvel Vs. Capcom 3, or the digital versions of the previous 2 games, than you best get on it NOW.
Because they will be gone.
Rumor has it that Disney is working on their own digital service. How that will work is not yet revealed. Similar to Origina and Steam perhaps.