Definately agree that the concept of summoning NEEDS a revisit. Being able to summon multiple copies of creatures would be an excellant start. Being able to summon more variety would be awesome as well.
However, I caution that summoning can't become too powerful that troops are again ignored. The fact that summoning doesn't require use of the city queue in itself is a HUGE benefit. If you had the ability to create an army through those means, troop production would cease.
I'm also not suggesting that summoning be too weak...else no one will persue it (as is in it's current state). IMO, the should be a Path of the Summoner, or perhaps a Sub-path to that of the mage for summoning so that mages can create solid summoned units if specialized to do so that are comparable to trained units. (maybe weaker summoned units if no training.....average with some training....and above average if specialized)
To add to the idea, the ability to summon SHOULD be just that: The ability to summon. The rest of the concept SHOULD be just as how the Binding spiders are treated. Have the ability to queue the summoned creature in your city training and have it cost mana + production instead of metal or crystal. The summoning duration can be shorter than normal troops since it's costing mana, which is valuable.
Combat summoning could and should still be instant casting since the creature disappears after combat ends....but permanent summoning seems like it should take a longer duration to materalize the creature, since you're getting the unit for a potentially indefinate period of time.
(besides, in MoM, summoned units all took time to build too).
The same should go for Knights of Asok, Wildings, Ogre mounds, etc etc. Rather than having incremental spawning times for these unit types, obtaining these sites should simply grant the closest city the ability to train these units in your queue. (Maybe give the first one for free at the site when obtained as an incentive and to show the player what the unit can do.....obviously, something would have to be done here so that a player does not raze, and rebuild the site for multiple free units). This ultimately gives the player the control as to whether or not those units are worth persuing. (those wildings need some kind of buff...maybe include a shaman).
Thoughts? Comments?