That's an idea but IMO our team will become totally unbalanced. Ideally in a 3 man midfield :
1. is the defensive screen whose main job is to guard the central defenders.
2. is the primary playmaker than can control the tempo of a game while in possession of the ball.
3. is a box-to box midfielder or has good dribbling ability/ mobility to extent plays.
If we look at some of the better traditional 4-3-3/ 4-3-1-2 teams of the past decade :
Gattuso 1, Pirlo 2, Seedorf 3
Busquets 1, Xavi 2, Iniesta 3.
Alonso 1/2 hybrid, Modric 2/3 hybrid, Di Maria 3.
Edmilson 1, Xavi 2, Deco 3.
If we replace the 2 with two #3s there's every chance to lose control of the game, especially vs possession oriented teams because even though Herrera and Strootman are technically gifted - neither those 2 or Blind have the vision or passing range to really impose themselves on the game. The sole example of a successful team using 2 box-to-box player in the central areas Juventus but they have Pirlo as the playmaker.
What we need more than anything else IMO is someone who is like a younger Xabi or Scholes in his older days when he just sat back and picked teams apart. A player like him surrounded by the energy, workrate and mobility of Herrera + Di Maria would be a deadly combination and instantly catapult the current lot into one of the best midfields in Europe. I think someone like Koke or Ruben Neves (very inexperienced) would be better suited to that role than Strootman because both have great vision and the requisite passing range/ defensive work-rate.