I think TK's main priority has to be promotion this season, which is sill well within our grasp, and is thus trying to improve the team - and defence is our main weakness - to this effect.
Not much point in planning for next season, if we don't know where we will be.
But the important thing is to give this season our very best shot. Focus on getting a result in the next game ahead, and who knows what will happen - the top two could start to falter, and indeed have already somewhat, and the play-ff's are definitely within our grasp.
IF we go up, then we will need to get in reinforcements anyway, suddenly becoming attractive to Prem quality players who would not join us as a Championship side, and we will also have the money to get them and pay their wages, with hopefully, a bit more success than last time, with lessons learnt from then.
Though I think we already have a core of Prem quality players, who will be used to playing together, though we obviously have defensive weaknesses, which the club seems to be trying to rectify, with the acquisition of Hector and Kongolo so far.