It depends on what rate they can buy the money long term fixed and what percentage they will take on top of that. A lot of banks put their long term fixed rates up in January, only by 10 to 20 points but that was a result in the costs of borrowing rising and opposite to the ECB current downward trend.
When lots of people are taking about fixing (its even been on the news regularly) that normally means you missed the best time to fix. The best time to fix was around xmas when the only talk was about getting out of fixed rates and the mention of fixing was met with comments like "why would you? the rates are dropping".
I would say we have a long time of downward and level inflation across the eurozone, so it is possible that long term fixed rates will drop further, but i cant see a 10 year fixed being much lower than +/- 4.30%, so current rates wont be a bad choice.