Oh yes we need him/someone like him. Sooner than later, especially after Iniesta retires. In my eyes Eriksen would be almost as perfect a replacement for Iniesta as Verratti is for Xavi. And a much better choice than Coutinho, who lacks consistency. And with Neymar in the same team, i suspect it would only get worse, for both of them actually. Don't need any more Brazilians here, thank you. While Eriksen in addition of being a great passer and set piece taker, his history is a lot more encouraging too (Ajax schooled boys very often seem to turn up pretty well in Barca).
Convincing Levy to sell would be a bitch yes, but like i said, if we manage to get Verratti from the one of the toughest (shittiest) negotiating clubs in the world this summer, then nothing is impossible anymore.