Why are you trying to make it sound as if without Kroos and Modric Real Madrid wasn't already beating Barcelona and winning trophies! Real Madrid is never in competition with a team like Barcelona, Real Madrid sets the record that even Barcelona is trying to follow in the league, instead it Barcelona that's in competition with Real Madrid. I understand your take, but don't make it seem as if those two players were the ones that took Real Madrid to the standards it has attained.
To be fair, before Modric and Kroos, they had players like Zidane and such, and afterwards, they have Jude and Valverde type players. Real Madrid is never a team that sucks, that never happened, not to Barcelona neither. In La Liga, you can be sure that these two teams will always finish in top three, in some cases Atletico Madrid becomes second or even first, but in most other cases these are top two teams.
So losing Kroos and Modric is of course hurting them, of course they would prefer to have them on their prime again, but that doesn't mean they are going to suck without them. They are going to be alright, and won't face that many issues and should be winning games. They may even end up winning the league this year.
Every player has their prime, and age also plays a role. Real Madrid is a team that doesn't rely on just one player. Modric and Kroos are no longer young, and their performance has declined significantly. So I never thought Real Madrid would slump just because they lost these two midfielders. In fact, I see the Real Madrid team always ready to regenerate, and now there's Jude, who can be relied on in Real Madrid's midfield.
Despite the fierce rivalry between Real Madrid and Barcelona, even when one team has many problems, it doesn't diminish the intensity of the competition for the La Liga title.