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It's not certain that the value of the Summoners will rise, but since they will always be leveled up and the supply of each Summoner will always be reduced, price increases are pretty likely.

But remember, there will always be new Summoners, making the more scarce, probably making the value of the old ones more *collectible" value.

Here's a limerick about it from last year...

Summoners are quite expensive,
But unless you are apprehensive,
You should load up today
So more cards you can play,
‘Cause next year’s price will be offensive.

Here's another one. Not investment advice. I just love limericks.

Summoners had steady rise,
Since Alpha and Beta’s demise.
Without them, your deck
Is a useless ol’ wreck,
So picking some up might be wise.


Have a great day!