Wolfsburg have close their chance for qualifying on Europe League next season behind 7 points left from Freiburg but has mission winning this game secure their position for UEFA Conference League qualifying under Bayern Leverkusen pressure with the same points right now. SC Freiburg on underperformance after two loss in a row from Union Berlin and Leipzig.
I think that both Union Berlin and SC Freiburg are great clubs that are very likeable and that have managed to play a very successful season even though they don't have the financial possibilities that many other Bundesliga clubs have that are ranking behind them at the moment. Still i don't think it is perfect for the Bundesliga as a whole if Union Berlin or Freiburg will be playing in the Champions League because usually such small clubs are usually not able to play such a good season two times in a row and it is also very much possible, that those clubs are losing their best players to bigger clubs after this season. So it is very much possible, that they will have a hard time in the CL next season.
One of those teams will play in the CL though that is already certain.
Now actually Freiburg's chance to be in the Champions League is over but they can still survive in the Europa League again.