Basel III is supposed to strengthen bank capital requirements by increasing bank liquidity and decreasing bank leverage.With Basel III the new regulatory framework more than triples the volume of assets that banks and savings banks must set aside for possible losses. Banks must raise their total capital from 2 percent of risk-weighted assets under Basel II to 7 percent (the 4.5 percent minimum plus the 2.5 percent buffer). Stress testing gone crazy to try and avoid a run on the banks like what happened in Europe etc.
As to why it would hamper the long term interest savings would be due to these having a higher risk ratio as the owner of the funds can withdraw from the bank at any time thusly reducing the banks lending ability even though the assets get a "liquidity" based weighting varying from 100% for government bonds and cash to weightings of 0-50% for corporate bonds.
http://www.sparke.com.au/sparke/new...ean_for_australian_financial_institutions.jsp
Hope this helps Julia.