Its because they are all jumping to Formula E no doubtFIA just cut the super license points requirement to complete in F1 from 40 points to 30 points which means Tsunoda and Mazepin are not going to have any barriers to competing in F1.
That said I don't see room for Tsunoda. I doubt they will get rid of Gasly or Albon, and I could see someone like Perez or Hulkenberg stepping in for Albon, resulting in Albon taking Kvyat's drive.
As much people criticize Grosjean's driving in recent years. His first two years he had a front runner and was able to mix it with the best. Pity Genii capital almost bankrupt Team Enstone when they had the Merc engine
i will defend Grosjean in a way because 2nd half of 2013. he was a brilliant driver & outscored everyone Vettel who won 10 of 11 races & Alonso in the Ferrari. not wrong to say was he was Vettel "rival"
but since 2014. hes never been able to hit the heights of what turned out to be a purple patch
Which makes Alfa/ Ferrari's decision baffling given Giovinazzi is in his 2nd year - he should be blowing away Kimi but he has not and at 26 years old Antonio is no longer considered a promising youngsterThere are two possible explanations for Kimi beating Giovinazzi. One is that Kimi has still "got it", his motivation is as high as ever etc.
I strongly favour the other explanation. After all, here's a guy who spent two of his prime years dicking around in rally cars at Ferrari's expense, when there were F1 drives available. Motivation as high as ever, I'm sure.
I'm afraid I'm of the Helmut Marko school. If the young one isn't fast enough, drop him and plug in another one. One of the best ways of finding talent - and it's not very sophisticated - is giving lots of drivers opportunities.