[Tax-chick]

I would say, “discussions like this,” because the speaker is relating other “discussions” to the ONE discussion currently taking place.

My daughter dreamed last night that she was practicing her three-point turns in the Methodist Church parking lot, with Pope Pius XII in the passenger seat.

[DCPatriot]

If you're speaking about discussions (plural topics/subject matter) that are taking place at that particular meeting, it's singular.

If you repeated the meeting it say two days later, it would be plural.

What did I win? LOL!