Subject: Whatever be the reactant, is the reaction possible?

Is the following reaction possible?
2H2O + 2I2 --> 2HI + O2
In general, for a reaction to occur it's Gibbs energy should be negative or 
change in entorpy should be positive or both. The point is, even if Gibbs 
energy is posivite it can be made negative by incerasing temperature of the 
reactants. So does this mean that whatever be the change in entropy (+ve or -
ve) the reaction would occur by making Gibbs energy negative which in turn 
implies that whatever be the reactant(s), reaction is always possible at 
certain temperature?

Re: Whatever be the reactant, is the reaction possible?