They will only be worth something when there are none left, and there are still plenty out there, going for rock bottom prices, in particular in the UK, admittedly most out there now are undesired spec for the current enthusiast Omega driver or potential Collector but currently theres still more available than current demand.
Look at the 3.0 and 3.2 Ex Plods, 10 years you couldn't give them away, now they've pretty much all gone, in parts, scraped or wrecked, the few remaining good ones are now demanding high prices but its still a specialist market, my prediction for the future Classic Omega is still of the same thinking, it will be the 3.0/3.2 V6 Elites and MV6's but only the surviving good examples will begin to hold there values but were a long, long way off before they become a High Value Classic.