The short answer in my opinion is "no, we won't get investment."
An Everton director Robert Earl is worth £200m but says he won't invest further without Everton moving away from Goodison Park, Jon Woods another Everton director who founded a video games/software development company Ocean Software that was sold for £100m doesn't want to or can't invest further and Chairman Bill Kenwright who describes himself as a "pauper" compared to other Chairman is a friend of billionaire Sir Philip Green, who is interested enough to give advice but not enough to invest into the club.
Matt (galacticarachnid) from here made a good point the other day, Everton don't actually need an investor if we want to qualify for Europe due to UEFA's new rules about not spending what we don't have.
What is needed is for the stadium issue to be resolved. There will be people interested in helping out with a new stadium, the problem is giving them enough of a return for their efforts. Everton can't afford to do that AND continue to set aside money for player wages.
If England is awarded the 2018 World Cup. I can see a ground-share going ahead.