Hey There, I'm fairly new to the market, and certainly no techy, but I've recently started mining BTC.

So far it's producing as planned, but while trying to predict how long it will take to mine enough BTC to payback my investment, and trying to decide if I should invest more,  I realized that sometime around the end of next year (right around when I'm thinking I'll break even), the block sizes being mined will split in half to 12.5BTC each, as they did in 2012 from 50 to 25. 

Does anyone have any insight into what this will mean for the value of Bitcoin and the profit of mining?  Is the value likely to rise as new bitcoins become more scarce overnight, or will my mining profits simply be cut in half, making it no longer viable?

About a month ago I sent about 1.56BTC from the exchange to my Multibit wallet.  When I opened Multibit to view it and confirm that the transaction processed, it showed a 0 balance with an error message that read "Unable to load blockchain"   
The error was "com.google.bitcoin.store.BlockStoreException Corrupted block store: could not find chain head........"
Nothing I have tried works and I am unable to sync with the network at all.
Please help.