I say that there are multiple reasons why the universe will not collapse according to evolution theorists but this has got to be a main one.
New energy is constantly being released into to our current dimension fueling the constant expansion and causing the increase of the expansion instead of decreasing it. Also the mass needed to cause a contraction of the current universe is "evaporating", which may explain why you can't find dark matter because it does not exist. Ergo supporting the verses in the bible that say the old heavens and earth shall pass away near the end of Revelations.
Rev 21:1 AndG2532 I sawG1492 a newG2537 heavenG3772 andG2532 a newG2537 earth:G1093 forG1063 theG3588 firstG4413 heavenG3772 andG2532 theG3588 firstG4413 earthG1093 were passed away;G3928 andG2532 there wasG2076 noG3756 moreG2089 sea.G2281