Sure. If we are talking in absolutes then, if you had millions, you could use any progression.
To truly have a HG system, you would probably need the following (my opinion based on the posts I've read over the years) :
1) System that works with a moderate bankroll (less than $500)
2) System that can be used on a live wheel without an enormous amount of waiting (betting at least once every five spins)
3) System that can be calculated in time to make proper bets
4) Bets must be placed before the dealer releases ball
5) System that everyone can learn (within reason-no "gut feeling" - just simple math)
What do you think?
HG on silver platter!!!