[kallerosenbaum]

[1]: Selfish mining may be a problem, and only big miners can profit from it. This has nothing to do with IBLTs though, other than that big miners may withhold them just as they would withhold a full block. The rest of us (small miners) can still use IBLTs to decrease our orphan rate.

"providing value-added services": Yes, it's up to each and every miner to decide how and when blocks are transmitted. If they want fast propagation, use IBLT. If not, use full block. Any relay node may as well chose to relay it as an IBLT or as a full block.

"Beyond a certain point there are many false positives and worst case all transactions might be needed to sent anyways": Definately yes! I will present some stats on that in future blog posts. Meanwhile you can look at https://github.com/kallerosenbaum/bitcoin-iblt/wiki for some data on this.