Leverkusen are now under the threat of losing the lead to Bayern Munich. Because if Bayern Munich win their missing game they are going to be taking the lead from them. Leverkusen could have won normally but they didn't have a lucky weekend. Despite showing a really impressive performance they had to make do with one point.
But even if Leverkusen lose the lead after this result I don't doubt them about their continuing to be competitive for the league title until the end of the season. They totally deserve to be one of the number one title contenders considering how great they perform.
A good team doesn't think "I am scared if I lose points I may not get the lead back", a good team thinks "even if I ever lose the top spot, I will win every game until I get it back", and if we are thinking that Leverkusen may not get it back, then they are not a good team that deserves the top spot. I am not thinking like that, I feel like even if they lose a few games in a row, they could still end up winning as much as required to win the title in the end, obviously there is a chance they may not, obviously Bayern may get it, but I wouldn't eliminate Leverkusen that easily, they are a pretty strong team that has done so wonderful so far this season and they could play the second half of the season even better as well.
Xabi Alonso has done something magnificent with the team and this is exactly why I keep saying if Ancelotti ends up leaving, Real Madrid should look into bringing Xabi to manage Real, both because he is an awesome manager, but also he played there too so he has connections.