Will Google always be the leader?

Do you think Google will always be the biggest company/ Search Engine?

I have always wondered to myself is Google always going to be the biggest company/ Search Engine or will a company like Yahoo eventually take the lead over them?

I have also wonder if maybe a new company will come out and take over them.. I think it seriously might happen even though they are so big.. There are some webmasters that are so good and if they webmaster it right I just it just might happen what do you think?

I will say..........Yest at least my remaining life.............:)