The Dilemma of Twitter Hashtags, Users and the English Language

One thing I've been noticing a lot lately on Twitter is the usage of hashtags or lack of. Such as:

• How keywords trend and not always with the # symbol.
• How prevalent homonyms and synonyms are. 
• How finding information on brands, topics, events and news is getting harder. 
• How individual minds think and tweet in their own cultural language. 

Due to all these variations will hashtags still be useful as Twitter grows, especially outside of the business user?

#Subway example

Notice how #subway is being utilized as Subway Sandwiches and the NY Subway. These results do not include @subway or subway tweets either - those are two separate searches.

I am all on board for metadata and folksonomy's, to include the good and the ugly, but I have to wonder in this mad fervor of brands and companies jumping on the Twitter bandwagon if they realize the impact of this, especially when they are trying to track and analyze the success of their Twitter campaigns.

I also wonder how Twitter is going to improve this - it almost seems there needs to be a sub-tag that identifies an object vs a brand, etc. A blend of a folksonomy and a categorized taxonomy might be a better answer and one that is quite possible.

And here is another example, one of my favorites: