upgrading spring traps

I was thinking that supercell should make upgrades for spring traps. for example level two spring trap should be able to remove a slightly bigger group of units, they would be unlocked at town hall level 5 and they would look like a regular spring trap covered with grass, level three spring traps would remove even more troops or remove one pekka, the level three spring trap would look like an iron spring trap and it would be unlocked at town hall level eight, the level four aka the maxed spring trap would remove a load of troops or remove one big golem but it would still remove one pekka, the level four spring trap would look like the iron spring trap but with red hot metal

what do you think of this idea?