Do you think it will be fine? What should be next steps then?
As long as you have the wallet.dat, you can recover the private key and thus spend those coins. Instead of downloading the whole blockchain again I suggest you try to restore it to where it was before you deleted it. Not sure how the timemachine works, but thats probably the easiest solution. Restore as much as you can and try to start bitcoin core again. If you can just send the coins to your bc.i wallet.