If there are millions of college kids who all need contract review within the span of a few days in the spring, I would expect the market to adapt in some way. The most likely, I think, is that employers (at least employers within an industry) would settle on some boilerplate contract, and law firms would let you upload a contract to their website, have a script run a diff, and come back "Yes, this is in fact the boilerplate contract, here is our plain-English summary" or "No, here's how it differs, you can retain us at normal rates to explain the diff or you can push back on your employer." (They could charge you a few bucks, or they could just have the cost of reviewing this year's boilerplate contract be paid by the employers, who are incentivized to successfully and legally hire interns.)

The more interesting question is whether if everyone knows there's a non-compete and it's the industry standard, there will be any more effective pushback... now that I think of it, I worry there may be less if contracts get mechanically standardized.