Well, of course the two probabilities add up to 1, that's the very basis of probability, but one side has a continue condition and the other has a stop condition. The low probability needs to only occur once to completely end the loop. At this point, the "loss" side "wins" so to speak.
However, the "win" side can NEVER win because succeeding on one roll just leads to another iteration with a lower probability of losing on this hand specifically. There is no end state. If you win again, you just roll again. THAT'S the problem. In order for you to hit infinity, there has to be no quantifiable way to continue, you won infinite times. The equation tends to infinity, but it will never reach it.
The only way you can ABSOLUTELY ensure that you will never fail is to have an ABSOLUTE 0% fail rate.