Well then let there be a reasonable time limit on the fight. I say 24 hours is enough. If you pin your opponent for that long you win. Blob WINS!
And as for DD being stronger than Hulk... ehh, check it! Compare some feats of strength and that argument should be settled quick. DD does NOT continue to get stronger and stronger through anger while Hulk does. After X amount of time Hulk's strength will be higher than DD's.
Blob is not up against INFINITE strength here, just VERY HIGH.
Blob will be able to absorb DD's hits in the desert pretty easily, be able to last a good amount of time like someone said due to his belly, and he has enough strength to put SOME hurting on DD. MAINLY, his power will allow him to pin DD for the time necessary to win the fight.