Why will it be brutal? The republicans hold a large majority now than during the Kavanaugh battle. Besides, I believe Trump will nominate a woman to replace RBG - hard to accuse a woman of sexual impropriety without coming off as completely tone deaf.
I expect different allegations against the next nominee, even Joan L. Larsen or Amy Coney Barrett, but the charges will be just as ugly. I won't speculate on the topic that the thug class will choose next time, but I have ideas. Truth is irrelevant to what we will see. Again.
If President Trump nominates Amy Coney Barrett, the Democrats will accuse her of being a religious extremist, who will force everyone to pray the Rosary three times a day. President Trump should nominate her anyway (if RBG resigns or dies).