It is not true that someone who starts from scratch will reach InA with 3-4 GB. Someone who starts from scratch will mainly spend the FP in research. New age means more research.
Hmm.. I I don't know exactly what would be the best...
But my way of thinking was:
On the day the GB were implemented, I researched the first research of CA. So I was not finished with everything.
Then I stopped my resaerches and spend all my FP in GBs. After 4weeks I was able to build St. Marks and Deal Castle. But let's just talk about St. Marks. St. Marks gives me a great bonus of coins. So I have millions of coins, althoug I have not finished everything. I think I will never have a lack of coins with St. Marks.
Now I thougt of players, who will build the St. Marks in HMA, with some weeks of don't spending FP in researches it's easy possible. They will have this great amount of coins (in relation to building costs and so on) three ages earlier. So it will be veryy very easy for them, to have enough coins for everything in HMA, LMA and CA. They will never have to worry about a lack of coins.
Although I always build 1h houses and collected coins like 10times a day (before the GBs came), I was not able to buid e.g. in LMA 8 academies on one day. I was only able to build 2 or 3. Then save some coins/supplies for some days and build the next academy and so on.
With the GB I think, this aspect of the saving ressources will get lost.
Another, other way to look at it is.
Why the InA should be harder/easier? I mean, yes you are in CA now with GB and waiting for the new age, but someone else is in HMA with 4-5 GB. Why shouldn't LMA (the next age of the other guy) be harder according to the same logic?
Because u can't change the costs of LMA, it's too late. InA is not out yet, so u can change the costs
It's wise to increase the FP costs, to shorten the time in which every player asks "when we will have the next age???"
And it would be wise to increase the coins/supplies-costs, because of the affect of St. Marks and Lighthouse (of course not to much).
And it would be wise to make sth. with the armies on the worldmap... I don't know what... a bonus on all would be not a good solution... I don't know, but with 150% or even 50% attackbonus it would be to easy to conquer worldmap, if they had no bonus.
I'm sure there are arguments for and against my thoughts... but I hope the devs saw these things and managed a good solution.