40-60. It will be a true wave, already the GOP is very vulnerable (the special elections are the canary in the coal mine). With more of Trump's disastrous presidency and a potential non-Trump made crisis, Republicans will have to count on gerrymandering to avoid a historic landslide.
Another potential cataclysmic disaster for Republicans is the fact that their Gerrymanders were designed to create lots of slightly Republican leaning seats in the R+2-5 range. But if Democrats can win by a 2010 or 2014 esque margins, the damn breaks as the Gerrymanders were only meant to protect them in a neutral or slight Democratic year. There is only so many GOP voters in each state, so those Gerrymanders work only up to a certain level.
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