Guys, even though this looks like a mostly European thread so far, I would also like to comment on what's next for Pattern from my standpoint in SW USA. The original question asks what's next in pattern and then goes on in to the $$ aspect. I know it's getting expensive for a 1st class airframe, but flying a quality pattern plane doesn't have to be out of sight $$$-wise. Many times in this forum, they've referred to the Focus, Tai Ji, Zen, used planes, etc. They can be had for about $500 or less. Heck, a U-Can-Do from Great Planes can perform the entire pattern sequence when the surfaces are toned down alot and it's only $189. You also don't have to buy a YS DZ or OS 1.40 RX. Many people survive well with a Supertigre 2300 or OS 1.60, both under $250. They're plenty of used YS FZ's around for $300 also. I've been flying RC for around 20 years and I've never seen so many good quality ARF pattern planes available. It's like every major manufacturer decided to invest in pattern all at once. (Maybe they know something I don't)
I've been flying IMAC planes for about 4 years and eventually quit (along with my son). We had two 33% Edges with 100-sized engines that cost around $7K together when dolled up. This was what I considered getting out of hand. Each person has their own "out of hand" level and I understand that. IMAC planes just kept getting bigger, requiring bigger vehicles to carry them in driving up $$$, I finally gave up. Others haven't and are even going larger!!! I remember the last IMAC tournament I went to, there were 2 guys in Basic with 40% Extras custom built!!
What I'm trying to say is every aspect of this hobby is becoming a "spend major $$$ to compete" avocation. Look at helicopters, giant scale racing, turbines, etc. I think pattern guys have got it right by still limiting the size to 2mx2m and weight to 11lbs. This will hopefully keep the sanity in check.
To finally answer the question, I think that Dick Hanson has it right with the gas engine. The hours of practice and fuel bill can eat much of that discretionary income in a season. We did a study while in IMAC and the conversion from a huge Saito 1.80 to a gas engine would pay for itself in only one season. At that time, the engine was just getting broken in and would last for years.
That's just my $.02 worth

!!!
John S. Johnson
Lubbock, TX
PS. I think pattern also keeps my flying skills honed the best and ready for turbines. The discipline is very helpful in all areas of this hobby.