The issue with that is if a player gets suppressed, they drop prone anyway.
From my point of view all the rules that force players into prone are a hindrence as it forces you either into LOS cover or prone out in the open. Other than the fact that any enemies in the initiative order between that "forced to prone" reaction and your turn do not get the negative modifiers for hitting you, you in any case get a chance to return more accurate fire.
Let's take a few situations. (FA-fast action, SA-slow action FrA-free action)
1) Attacked while walking in a ditch
a) You are forced prone
- FA stand up
- SA shoot
- FrA prone
b) You are standing
- FA aim
- SA shoot
- FrA prone
Being already stood up gives you a better chance to return fire
2) You are attacked out in the open
a) You are forced prone
- FA stand up
- FA run into cover
- FrA prone
or
- SA shoot
- FA crawl
You may not have reached cover
b) You are standing
- SA shoot
- FA run into cover
- FrA prone
The second case can be argued to be more beneficial in prone because you already were prone for several turns if you choose only to aim and fire and not move, but that already implies you were comfortable with staying just out in the middle of the kill zone, which seems odd.