Unlikely that much tax evasion would be found, just more examples of (legitimate) tax avoidance. Few media would be interested in rooting through details for examples of deductions-for-rich-people without Trump's name to attach to them. Politicians' tax returns aren't ordinarily newsworthy despite the amount of tax avoidance they achieve. The exception is tax returns of Republican presidential candidates, which are always dug through in order to highlight apparently egregious examples of tax avoidance.
If Trump has criminally evaded taxes, that information was already available to investigators and didn't require public exposure.
In order to punish legitimate tax avoidance by Trump, the rules would have to be changed, and that would punish a lot more people. I suppose that would constitute a kind of unwanted blow-back for a short-sighted decision to blast examples of applications of the US tax code all across the media. It'd be awesome to see, though. I can imagine a lot of jaws dropping in DC if "the people" became incensed enough to successfully press for tax reform which terminated a hockey sock of deductions.