No, they want to grow them to 8MB, with non-witness blocks being 2MB, which a) requires a hard fork, and b) is vulnerable due to the quadratic hash validation issue (they're saing it's 2MB solely to cause confusion on this point). If they really wanted 8MB blocks, they could do so mostly safely by increasing the non-witness weight to 8x, so as to leave non-witness blocks at 1MB, but they're not interested in increasing capacity safely; they just want to take over the network, or destroy it in the attempt.