I believe Stuttgart will manage to qualify for the Champions League group stage, what is your opinion? I know there is a good progress in Dortmund and Leipzig's form recently as well but a gap of six points is a really good advantage for Stuttgart to make it. 
I agree with you because Stuttgart has been very impressive at this middle of the season because there record lately is very commendable Whereas there last six matches has been so favourable for them because they were able to win five matches and draw just one match which shows that they are in a good shape and like you said there points difference with Borussia Dortmund and RB Leipzig is quite much because it will take time for Borussia Dortmund to get to the same points with Stuttgart because checking the matches Stuttgart will play they will have an advantage of wining most of the matches, so for now is actually possible that Stuttgart will qualify for the champions League next season.
Stuttgart's qualification to the Champions League next season will be determined by their performance during the remainder of the season. They've been playing exceptionally well for quite some time now, and if they can maintain this level of performance, they'll finish in the top four and qualify for Champions League. I don't recall ever seeing them play in the Champions League; if they do, we will see a new Bundesliga team demonstrate their strength in the competition alongside other top European teams. With a six-point lead over Borussia Dortmund, they are currently in third place; all they need to do now is stay consistent, and they will finish in the top four by the end of the season. I feel either Borussia Dortmund or RB Leipzig will have to play in the Europa League next season and not Stuttgart.
Actually i never thought Stuttgart will be very impressive this season because in the last 2 season Stuttgart always be fight to avoiding relegation zone even last season Stuttgart have to through an play off stages against Hamburg to determine their position on Bundesliga 1 but everything was change when Sebastian Hoeness handle this team since early season because Stuttgart this season was change became an strong team even at the beginning of season Stuttgart can able to occupy first place several times and with their current performance i am sure Stuttgart will be able to secured Champion league spots