Catching up on the six points already owned by Bayern Munich is not easy for Frankfurt if Bayern Munich is still strong enough to dominate the Bundesliga this season. Moreover, if Frankfurt itself does not have the power to surpass the strength of Bayern Munich so that it will also be a very real obstacle for Frankfurt and even Frankfurt's position itself is still likely to be taken by Leverkusen if Frankfurt's consistency does not continue to increase in the upcoming matches.
6 points is not an easy distance to catch up, but it is not impossible to do as long as they can continue to get full points and they need Bayern Munich to stumble a little. They will still meet and in their meeting Frankfurt should be able to take advantage of that to beat Bayern Munich. However, this is clearly not easy to do, because beating a team like Bayern Munich must have a hard work and sometimes also requires a little luck to do that. With Leverkusen's success last season, that could be a motivation for them.
If this was the reverse, like if Bayern was six points behind, I would agree that it would be not impossible for Bayern to catch up, and that's what I would say right now. However, when Bayern Munich is six points ahead of everyone else, it is not really that easy for anyone else to catch up to them. Bayern Munich is the greatest team in this league, they have more championships than all teams, and because of this they grew bigger and right now they have enough financial power to make the team better every season.
Right now, they have a great team, and nobody else have any good season, normally if any team did what Leverkusen did last season then I would say maybe there would be a chance, but no other team is doing good neither, so we can say that it is not really that simple at all.
I believe the best we can move forward with could be just focusing on what kind of return we are going to have, and for that to mean something we need to focus on how to get better returns without a doubt. Bayern Munich will not be caught by anyone, they are going to end the season as champions, I know there are plenty of games left, but the gap will just continue to grow even further, they will finish with more than six points gap.