"will only occur" is correct and usable in written English.
You can use it to emphasize the extent of an event, such as "Malfunctions of this magnitude will only occur in highly unusual circumstances."
Meaningful change will only occur when lawyers confront the living reality of sexism.
Widespread enrollment in green power programs will only occur with a level economic playing field.
This evaluation will only occur after the criminal case has concluded".
That will only occur if the US now gives the leadership we need.
Meanwhile, we suspect that more QE will only occur should the economy suffer a marked relapse over the coming months.
His full recognition will only occur when he is awarded his Military Cross and a full explanation is given as to why he was refused.
"But what is important is the convergence of stimulus plans, to trigger a mass effect, and this will only occur during the first quarter of 2010".
Tax giveaways in the budget will be paid for by savings that are uncertain or will only occur decades from now, the Institute for Fiscal Studies has warned.
Multiplicity for the chosen model reaction will only occur under rather severe conditions.
In addition, pitting will only occur if the critical state is established <10 s.
Staving off more tragedies of the global commons will only occur through painstaking global horse trading.
