The thing I am most doubtful about is the uncapped amount of SiaCoin that can be mined. Surely this will severely impact the potential value increase of this token? I guess only time will tell.
I think the technology is great, and potentially it can propel this token to the top 5 in market cap in the future, which would also make a substantial value per token possible.
RE: SIA to compete with dropbox? Invest in siacoin long?