Invest or Pay Down Mortgage?

Facts
1. Have 30k at disposal;
2. Mortgage is 2.45% fixed till March 2015;
3. The combined unused TFSA room in my family is around 40k.
4. A number of TFSA investment options can net me more than 2.45% annual returns, for example, People's Trust TFSA @3%.

Assumption
1. IMHO, BOC's benchmark interest rate is more likely to rise than to drop in the next couple of years. That will likely(?) give upward pressure on TFSA saving rates.
2. If so, the TFSA return will benefit. (And my mortgage rate will hold steady in the next 2 years.)
3. The TFSA generates a return higher than the mortgage interest and I make/save money.

Questsion:
Would it make sense for me to hold off paying down the mortgage and invest the money in the next 2 years (or until the situation changes to a point where paying down the mortgage will make more sense)?

Or, when considering other factors (for example, and I am not sure if this is the case, the compound interest accummulation in a mortgage), it is wiser to pay down the mortgage?

And I am no economist -- please forgive my ignorance and feel free to correct my misunderstanding (if any).

Thanks in advance!