The chances of lengthy custodial sentences being applied to misuse of lasers affecting aviation is very, very slim. My rationale?
The scum that drop or place lumps of concrete or steelwork onto roads and railways hardly ever get charged with:
a) Murder
b) Attempted Murder
c) Manslaughter
d) Possession of an offensive weapon
e) Anything
Things might change if there was a large loss of life but I doubt it. The law at least in the UK is, and continues to be, an ass.