In your position my "safe" option would be to keep your points where they are.
Finding Business class seats for 4 people on the one flight is incredibly difficult at the best of times, but the airline which will give you the best chance of doing that is Singapore Airlines, whose transfer rates are not being devalued today and which will remain at 3:1.
A less safe, but still worth considering, option is to transfer at least some of your points today to some flavour of Avios (Qatar or BA), since Avios are a pretty safe bet when it comes to redempton opportunities and presumably that's what you used for your recent Qatar redemption.
You have 3 million points -- that's a helluva lot of points. One option would be to transfer maybe 1.44 million points to Qatar Avios (that gives you enough Avios for a return trip to Europe for 4 in Business class) and keep the rest in your MR account?