Talking only about current scenario of Bank nifty options,
(i don't want to talk about futures vs options), dont think option writers are making very good money in Bank nifty options. It may be true in Nifty options and stock options. But in Bank nifty options the movements are fast after we cross 24000 levels since, hence writers also loosing big in bank nifty option writing.
For example, see today it fell today and nobody knows tomorrow what can happen. if markets open up or down big say 500 or 600 pts gap, option writers will loose big in this week expiry. After weekly expiry started, many option writers loosing big money.